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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2010-12-20
High Selectivity Broadband Bandpass Filter with Dual-Mode Folded-T-Type Resonator
By
Hong-Wei Deng,

    Dr. Hong-Wei Deng

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Yong-Jiu Zhao,

    Dr. Yong-Jiu Zhao

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Xue-Shun Zhang,

    Dr. Xue-Shun Zhang

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Wen Chen,

    Dr. Wen Chen

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Wei Liu

    Dr. Wei Liu

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 19, 163-169, 2010
doi:10.2528/PIERL10111701 | Google Scholar

Abstract
In this letter, a compact and high selectivity broadband bandpass filter (BPF) is proposed using the dual-mode folded-T-type resonator and the short stub loaded parallel-coupling feed structure. The resonator can generate one even-mode and one odd-mode in the desired band. Two resonant frequencies can be adjusted easily to satisfy the bandwidth of the BPF. A parallel-coupling feed structure with a cross coupling has been applied to generate two transmission zeros in the lower and upper stopband. Furthermore, the loaded short stub can create two transmission zeros near the upper cut-off frequency and in the upper stopband. Simultaneity, the transmission zero in the lower stopband moves towards the cut-off frequency. One filter prototype with the fractional bandwidth 57% is fabricated for experimental verification of the predicted results. The size for the resonator is only 0.156λg×0.303λg in which λg is the guided wavelength of 50 Ω microstrip at the center frequency.
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Citation
Hong-Wei Deng, Yong-Jiu Zhao, Xue-Shun Zhang, Wen Chen, and Wei Liu, "High Selectivity Broadband Bandpass Filter with Dual-Mode Folded-T-Type Resonator," Progress In Electromagnetics Research Letters, Vol. 19, 163-169, 2010.
doi:10.2528/PIERL10111701
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